> For the complete documentation index, see [llms.txt](https://docs.parallels.com/landing/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.parallels.com/landing/pdfm-ug/v20-zh-tw/parallels-desktop-for-mac-20-shi-yong-zhi-nan/jin-jie-zhu-ti/shi-yong-xu-ni-ji-qi/she-ding-fen-pei-gei-xu-ni-ji-qi-de-chu-li-qi-shu-liang.md).
# 設定分配給虛擬機器的處理器數量
Parallels Desktop for Mac 會根據您 Mac 的 CPU 中的實體核心數自動計算允許的虛擬 CPU 最大數量。以下是系統中 N 個邏輯核心的分配方式 (在 Apple Silicon 系統中，N 通常等於實體核心數，而在 Intel 型的系統中，歸功於超執行緒技術，N 通常是實體核心數的兩倍)：
設定檔*
自動分配的虛擬核心數
生產力與軟體測試
N<8 時為 2 個虛擬核心，否則為 4 個
僅遊戲
大於或等於 N/2 的最小偶數 (例如，16 核心 CPU 為 8，18 核心 CPU 為 10)
設計與軟體開發
小於或等於 N/2 的最大偶數 (例如，16 核心 CPU 為 8，18 核心 CPU 為 8)
所有其他案例
2 個虛擬核心
\*如需瞭解有關設定檔的詳細資訊，請參閱指南的[本頁面](/landing/pdfm-ug/v20-zh-tw/parallels-desktop-for-mac-20-shi-yong-zhi-nan/zai-mac-shang-shi-yong-windows/zui-jia-hua-xiao-neng/zui-jia-hua-you-xi-tu-xing-chan-neng-huo-kai-fa-de-xu-ni-ji-qi.md)。
但是，如果經常同時執行多個虛擬機器，自動分配核心可能會導致資源衝突。我們建議手動設定指派給每個虛擬機器的 CPU 數量。如需手動核心分配限制，請參閱[此頁面](/landing/pdfm-ug/v20-zh-tw/parallels-desktop-for-mac-20-shi-yong-zhi-nan/parallels-desktop-pian-hao-she-ding-he-xu-ni-ji-qi-she-ding/xu-ni-ji-qi-she-ding/ying-ti-she-ding/cpu-ji-ji-yi-ti-she-ding.md)。
{% hint style="warning" %}
**附註：**儘管大多數現代應用程式都是針對多核心處理器而設計的，但並非所有應用程式都能同樣受益於增加可用的核心數量。增加虛擬核心數量不一定總是會帶來相應的效能提升。
{% endhint %}
要設定給一個虛擬機器分配多少個處理器：
1. [關閉虛擬機器](/landing/pdfm-ug/v20-zh-tw/parallels-desktop-for-mac-20-shi-yong-zhi-nan/zai-mac-shang-shi-yong-windows/kai-shi-shi-yong/guan-bi-huo-zhong-zhi-windows.md)。
2. 開啟「**動作**」功能表並選取「**組態**」。
3. 按一下「**硬體 > CPU 和記憶體**」並從「**處理器**」功能表選取一個數目。
{% hint style="info" %}
**附註：**在 Parallels Desktop for Mac 中，您最多可以指派 4 個核心給一部虛擬機器。在 Parallels Desktop for Mac Pro 版中，您最多可以指派 16 個核心。
{% endhint %}
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